md5.c

abstract rtos

#include "syscfg.h"

#ifdef __cplusplus
#if __cplusplus
extern "C"{
#endif 
#endif 


#include "aos.h"

#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define SS32 11  
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21



static U8 PADDING[64] = {
  0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
#define I(x, y, z) ((y) ^ ((x) | (~z)))

#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))

#define FF(a, b, c, d, x, s, ac) { \
 (a) += F ((b), (c), (d)) + (x) + (U32)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define GG(a, b, c, d, x, s, ac) { \
 (a) += G ((b), (c), (d)) + (x) + (U32)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define HH(a, b, c, d, x, s, ac) { \
 (a) += H ((b), (c), (d)) + (x) + (U32)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }
#define II(a, b, c, d, x, s, ac) { \
 (a) += I ((b), (c), (d)) + (x) + (U32)(ac); \
 (a) = ROTATE_LEFT ((a), (s)); \
 (a) += (b); \
  }

static VOID MD5Transform (U32 [4], U8 [64]);
static VOID Encode (U8 *, U32 *, U32);
static VOID Decode (U32 *, U8 *, U32);
static VOID MD5_memcpy(U8 *, U8 *, U32);
static VOID MD5_memset(U8 *, S32, U32);

VOID MD5Calc(U8 *output, U8 *input,U32 inlen)
{
	MD5_CTX	context;

	MD5Init(&context);
	MD5Update(&context, input, inlen);
	MD5Final(output, &context);
}

VOID MD5Init(MD5_CTX *context)
{
  context->count[0] = context->count[1] = 0;
  context->state[0] = 0x67452301;
  context->state[1] = 0xefcdab89;
  context->state[2] = 0x98badcfe;
  context->state[3] = 0x10325476;
}

VOID MD5Update(MD5_CTX *context, U8 *input, U32 inputLen)
{
  U32 i, index, partLen;

  
  index = (U32)((context->count[0] >> 3) & 0x3F);

  
  if ((context->count[0] += ((U32)inputLen << 3))
   < ((U32)inputLen << 3))
 context->count[1]++;
  context->count[1] += ((U32)inputLen >> 29);

  partLen = 64 - index;

  if (inputLen >= partLen) {
 MD5_memcpy
   ((U8 *)&context->buffer[index], (U8 *)input, partLen);
 MD5Transform (context->state, context->buffer);

 for (i = partLen; i + 63 < inputLen; i += 64)
   MD5Transform (context->state, &input[i]);

 index = 0;
  }
  else
 i = 0;

  
  MD5_memcpy
 ((U8 *)&context->buffer[index], (U8 *)&input[i],
  inputLen-i);
}

VOID MD5Final(U8 digest[16], MD5_CTX *context)
{
  U8 bits[8];
  U32 index, padLen;

  
  Encode (bits, context->count, 8);

  index = (U32)((context->count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  MD5Update(context, PADDING, padLen);

  
  MD5Update(context, bits, 8);

  
  Encode (digest, context->state, 16);

  MD5_memset ((U8 *)context, 0, sizeof (*context));
}

static VOID MD5Transform (U32 state[4], U8 block[64])
{
  U32 a = state[0], b = state[1], c = state[2], d = state[3], x[16];

  Decode (x, block, 64);

  
  FF (a, b, c, d, x[ 0], S11, 0xd76aa478); 
  FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); 
  FF (c, d, a, b, x[ 2], S13, 0x242070db); 
  FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); 
  FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); 
  FF (d, a, b, c, x[ 5], S12, 0x4787c62a); 
  FF (c, d, a, b, x[ 6], S13, 0xa8304613); 
  FF (b, c, d, a, x[ 7], S14, 0xfd469501); 
  FF (a, b, c, d, x[ 8], S11, 0x698098d8); 
  FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); 
  FF (c, d, a, b, x[10], S13, 0xffff5bb1); 
  FF (b, c, d, a, x[11], S14, 0x895cd7be); 
  FF (a, b, c, d, x[12], S11, 0x6b901122); 
  FF (d, a, b, c, x[13], S12, 0xfd987193); 
  FF (c, d, a, b, x[14], S13, 0xa679438e); 
  FF (b, c, d, a, x[15], S14, 0x49b40821); 

 
  GG (a, b, c, d, x[ 1], S21, 0xf61e2562); 
  GG (d, a, b, c, x[ 6], S22, 0xc040b340); 
  GG (c, d, a, b, x[11], S23, 0x265e5a51); 
  GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); 
  GG (a, b, c, d, x[ 5], S21, 0xd62f105d); 
  GG (d, a, b, c, x[10], S22,  0x2441453); 
  GG (c, d, a, b, x[15], S23, 0xd8a1e681); 
  GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); 
  GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); 
  GG (d, a, b, c, x[14], S22, 0xc33707d6); 
  GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); 
  GG (b, c, d, a, x[ 8], S24, 0x455a14ed); 
  GG (a, b, c, d, x[13], S21, 0xa9e3e905); 
  GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); 
  GG (c, d, a, b, x[ 7], S23, 0x676f02d9); 
  GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); 

  
  HH (a, b, c, d, x[ 5], S31, 0xfffa3942); 
  HH (d, a, b, c, x[ 8], SS32, 0x8771f681); 
  HH (c, d, a, b, x[11], S33, 0x6d9d6122); 
  HH (b, c, d, a, x[14], S34, 0xfde5380c); 
  HH (a, b, c, d, x[ 1], S31, 0xa4beea44); 
  HH (d, a, b, c, x[ 4], SS32, 0x4bdecfa9); 
  HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); 
  HH (b, c, d, a, x[10], S34, 0xbebfbc70); 
  HH (a, b, c, d, x[13], S31, 0x289b7ec6); 
  HH (d, a, b, c, x[ 0], SS32, 0xeaa127fa); 
  HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); 
  HH (b, c, d, a, x[ 6], S34,  0x4881d05); 
  HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); 
  HH (d, a, b, c, x[12], SS32, 0xe6db99e5); 
  HH (c, d, a, b, x[15], S33, 0x1fa27cf8); 
  HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); 

  
  II (a, b, c, d, x[ 0], S41, 0xf4292244); 
  II (d, a, b, c, x[ 7], S42, 0x432aff97); 
  II (c, d, a, b, x[14], S43, 0xab9423a7); 
  II (b, c, d, a, x[ 5], S44, 0xfc93a039); 
  II (a, b, c, d, x[12], S41, 0x655b59c3); 
  II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); 
  II (c, d, a, b, x[10], S43, 0xffeff47d); 
  II (b, c, d, a, x[ 1], S44, 0x85845dd1); 
  II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); 
  II (d, a, b, c, x[15], S42, 0xfe2ce6e0); 
  II (c, d, a, b, x[ 6], S43, 0xa3014314); 
  II (b, c, d, a, x[13], S44, 0x4e0811a1); 
  II (a, b, c, d, x[ 4], S41, 0xf7537e82); 
  II (d, a, b, c, x[11], S42, 0xbd3af235); 
  II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); 
  II (b, c, d, a, x[ 9], S44, 0xeb86d391); 

  state[0] += a;
  state[1] += b;
  state[2] += c;
  state[3] += d;

  MD5_memset ((U8 *)x, 0, sizeof (x));
}

static VOID Encode (U8 *output, U32 *input, U32 len)
{
  U32 i, j;

  for (i = 0, j = 0; j < len; i++, j += 4) {
 output[j] = (U8)(input[i] & 0xff);
 output[j+1] = (U8)((input[i] >> 8) & 0xff);
 output[j+2] = (U8)((input[i] >> 16) & 0xff);
 output[j+3] = (U8)((input[i] >> 24) & 0xff);
  }
}

static VOID Decode (U32 *output,U8 *input, U32 len)
{
  U32 i, j;

  for (i = 0, j = 0; j < len; i++, j += 4)
 output[i] = ((U32)input[j]) | (((U32)input[j+1]) << 8) |
   (((U32)input[j+2]) << 16) | (((U32)input[j+3]) << 24);
}


static VOID MD5_memcpy (U8 * output,U8 * input,U32 len)
{
  U32 i;

  for (i = 0; i < len; i++)
 output[i] = input[i];
}

static VOID MD5_memset (U8 * output, S32 value, U32 len)
{
  U32 i;

  for (i = 0; i < len; i++)
 ((S8 *)output)[i] = (S8)value;
}

void MD5_cvthex(SNMPHASH Bin,SNMPHASHHEX Hex)
{
    U8 i;
    U8 j;

    for (i = 0; i < SNMP_MD5_AUTH_HASHLEN; i++)
    {
        j = (Bin[i] >> 4) & 0xf;
        if (j <= 9)
        Hex[i*2] = (j + '0');
        else
        Hex[i*2] = (j + 'a' - 10);
        j = Bin[i] & 0xf;
        if (j <= 9)
        Hex[i*2+1] = (j + '0');
        else
        Hex[i*2+1] = (j + 'a' - 10);
    }

    Hex[SNMP_MD5_AUTH_HASHHEXLEN] = '\0';
}
#ifdef __cplusplus
#if __cplusplus
}
#endif 
#endif